wm8903 Wolfson Microelectronics plc, wm8903 Datasheet - Page 9

• Manufacturer Part Number: wm8903
• Description: Ultra Low Power Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
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Single-ended stereo record from analogue microphones - IN2L / IN2R pins to ADC output
Test conditions:
L_MODE = R_MODE = 00b (Single ended)
LIN_VOL = RIN_VOL = 11111b (+28.3dB)
Total signal path gain = +34.3dB, incorporating 6dB single-ended to differential conversion gain
PARAMETER
Single-ended mic input full-scale
Signal Level (for ADC 0dBFS
output)
Input Resistance
Input Capacitance
DC offset
Signal to Noise Ratio
Total Harmonic Distortion
Total Harmonic Distortion + Noise
Channel Level Matching
Power Supply Rejection Ratio
Differential stereo record from analogue microphones - IN1L+IN2L / IN1R+IN2R pins to ADC output
Test conditions:
L_MODE = R_MODE = 10b (Differential mic)
LIN_VOL = RIN_VOL = 00111b (+30dB)
Total signal path gain = +30dB
PARAMETER
Differential Mic Input Full Scale
Signal Level
IN1L-IN2L / IN1R-IN2R (for ADC
0dBFS output)
Input Resistance
Input Capacitance
DC Offset
Signal to Noise Ratio
Total Harmonic Distortion
Total Harmonic Distortion + Noise
Common Mode Rejection Ratio
Channel Separation
Channel Level Matching
PSRR (Referred to Input)
SYMBOL
SYMBOL
THD+N
THD+N
CMRR
PSRR
PSRR
SNR
SNR
THD
THD
R
C
R
C
in
in
in
in
10kHz signal, -31dBV
20kHz, 100mV pk-pk
20kHz, 100mV pk-pk
TEST CONDITIONS
1kHz signal, -35dBV
TEST CONDITIONS
1kHz signal, -31dBV
1kHz signal, -31dBV
At ADC output with
1kHz, 100mVpk-pk
At ADC output with
1kHz, 100mVpk-pk
1kHz, 100mVpk-pk
ADC_HPF_ENA=0
ADC_HPF_ENA=0
-35dBV input
-35dBV input
-31dBV input
-31dBV input
A-weighted
A-weighted
MIN
MIN
100
10
189813
11864
0.019
0.055
0.032
0.089
-34.3
TYP
TYP
+/-3
+/-1
120
742
-78
-77
-30
-78
-72
12
10
47
73
60
40
10
75
60
85
80
60
40
PP, Rev 3.1, August 2009
MAX
MAX
WM8903
LSBs (24-bit)
LSBs (16-bit)
LSBs (24-bit)
LSBs (16-bit)
Vpk-pk
Vpk-pk
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
Vrms
Vrms
UNIT
UNIT
dBV
dBV
kΩ
kΩ
pF
dB
dB
pF
dB
dB
dB
dB
9